Streptochilus globigerum


Classification: pf_cenozoic -> Guembelitrioidea -> Chiloguembelinidae -> Streptochilus -> Streptochilus globigerum
Sister taxa: S. globulosum, S. globigerum, S. latum, S. subglobigerum, S. inglei, S. macdougallae, S. cetacense, S. mascarenense, S. pristinum, S. rockallkiddense, S. tasmanense, S. martini, S. sp.,

Taxonomy

Citation: Streptochilus globigerum (Schwager 1866)
Rank: species
Basionym: Textilaria globigera
Taxonomic discussion: Orthography: Streptochilus is a neuter name so the coreect epithet is globigerum not globigerus - see also the page on S. pristinum. 

Catalog entries: Textilaria globigera

Type images:

Distinguishing features: Rugose test, with globose chambers.

NB These concise distinguishing features statements are used in the tables of daughter-taxa to act as quick summaries of the differences between e.g. species of one genus.
They are being edited as the site is developed and comments on them are especially welcome.

Description


Test morphology: Minute biserial test with six to seven pairs of inflated chambers, tending to become globular in the later stages. Wall calcareous, perforate-ornamented with rugae. Aperture a high arch extending from the base of the last chamber onto the apertural face and bordered by a distinct lip. [Kennett & Srinivasan 1983]

Character matrix

test outline:Triangularchamber arrangement:Biserialedge view:Compressedaperture:Interiomarginal
sp chamber shape:Globularcoiling axis:N/Aperiphery:N/Aaperture border:Thin flange
umb chbr shape:Globularumbilicus:N/Aperiph margin shape:Broadly roundedaccessory apertures:None
spiral sutures:Moderately depressedumb depth:N/Awall texture:Reticulateshell porosity:Microperforate: <1µm
umbilical or test sutures:Moderately depressedfinal-whorl chambers:2.0-2.0 N.B. These characters are used for advanced search. N/A - not applicable

Biogeography and Palaeobiology


Geographic distribution: Tropical to warm subtropical. [Kennett & Srinivasan 1983]

Phylogenetic relations:

Distinguished from St. tokelauae, a Pliocene-Quaternary form, by its globose chambers and distinctly rugose test surface. St. tokelauae probably evolved from St. globigerum during the Early Pliocene. St. latum Bronnimann and Resig and St. pristinum Brönnimann and Resig are closely related. [Kennett & Srinivasan 1983]

Molecular Genotypes recognised (data from PFR2 database, June 2017), one genotype only from 19 sequences. References: Darling et al. 2009; Seears et al. 2012.

Most likely ancestor: Streptochilus latum - at confidence level 2 (out of 5). Data source: Resig 1989, fig. 2.
Likely descendants: Streptochilus globulosum;

Biostratigraphic distribution

Geological Range:
Notes: Kennett & Srinivasan 1983 give a much earlier FAD of N14 for the species, than Resig 1989 (N17B) but they may have used a broader species concept. They also gave a LAD of N19, which is contradicted by plankton records of the species.
Last occurrence (top): Extant Data source: present in the plankton (Darling et al. 2009)
First occurrence (base): within N17b zone (5.72-6.60Ma, base in Messinian stage). Data source: Resig 1989

Plot of occurrence data:

Primary source for this page: Kennett & Srinivasan 1983, p.21

References:

Darling, K. F., Thomas, E., Kasemann, S. A., Seears, H. A., Smart, C. W. & Wade, C. M. (2009). Surviving mass extinction by bridging the benthic/planktic divide. Proc. Natl. Acad. Sci. U. S. A.. 106: 12629-12633. gs

Kennett, J. P. & Srinivasan, M. S. (1983). Neogene Planktonic Foraminifera. Hutchinson Ross Publishing Co., Stroudsburg, Pennsylvania. 1-265. gs

Miranda-Martinez, A. Y., Carreño, A. L. & McDougall, K. (2017). The Neogene genus Streptochilus (Brönnimann and Resig, 1971) from the Gulf of California. Marine Micropaleontology. 132: 35-52. gs

Resig, J. M. (1989). Stratigraphic distribution of late Neogene species of the planktonic foraminifer Streptochilus in the Indo-Pacific. Micropaleontology. 35(49-62): -. gs

Schwager, C. (1866). Fossile Foraminiferen von Kar Nikobar, Reise der Oesterreichischen Fregatte Novara um Erde in den Jahren 1857, 1858, 1859 unten den Befehlen des Commodore B. Von Wuellerstorf-Urbair. Geologischer Theil, Geologische Beobachtung no. 2, Palaeontologische Mittheilung. 2: 187-268. gs

Seears, H. A., Darling, K. F. & Wade, C. M. (2012). Ecological partitioning and diversity in tropical planktonic foraminifera. BMC Evolutionary Biology. 12(54): 1-15. gs


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Streptochilus globigerum compiled by the pforams@mikrotax project team viewed: 17-9-2019

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Short stable page link: http://mikrotax.org/pforams/index.php?id=104223 Go to Archive.is to create a permanent copy of this page - citation notes



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